LeConte.] 380 [Feb. 1, 
O. discretus, but very different by the sides of the dise of 
the prothorax being quite straight for nearly two-thirds the 
length. j 
14. Ochthebius attritus, n. sp.—Elongate-oval, bronzed. Head 
sparsely but strongly punctured, with two occipital foves, and deep frontal 
suture. Prothorax wider than long, narrowed behind, pellucid margin 
very narrow, visible only behind the middle; dise strongly punctured, not 
lobed at the sides, dorsal channel deep, discoidal impressions small, sepa- 
rate, lateral impression broad, shallow. Elytra less shining, strize com- 
posed of nearly square, close-set punctures, not obliterated at the tip. Be- 
neath blackish, legs testaceous. Length 1.5 mm.; .06 inch. 
Haulover, March, one specimen. Related to O. cribricol- 
dis, but much narrower and smaller, and with distinct, though 
not deep, discoidal impressions. 
15. Ochthebius simplex, n. sp.—Oval, more convex, bronzed, less 
shining. Head sparsely, strongly punctured, with two occipital foves, 
and deep frontal suture. Prothorax wider than long, slightly narrowed 
behind, pellucid margin very narrow, visible behind the middle; disc 
strongly punctured, not lobed at the sides, dorsal channel deep, discoidal 
impressions scarcely visible ; lateral impressions nearly obsolete ; a small, 
shallow fovea is seen near the hind angle. Elytra with rows of close-set, 
not very fine punctures, not obliterated behind. Legs testaceous. Length 
1.2 mm.; .048 inch. 
Haulover, March, one specimen. Very much smaller and 
more convex than O. cribricollis, with the lateral impressions 
small and indistinct. 
16. Ochthebius tuberculatus, n. sp.—Longer and less convex 
than A. nitidus, piceous-bronze, shining. Head with two large fover, and 
deep, transverse suture. Prothorax wider than long, sides moderately 
rounded, pellucid margin represented only by a small lateral spot, and one 
at the hind angles; disc not punctured, dorsal channel very deep, dis- 
coidal impressions very deep; each side a small, round fovea in front of the 
middle, a longer slightly oblique one behind the middle, and another one 
near the side, which is strongly lobed ; the proiongations of the disc to the 
anterior angles are very convex, forming a large tubercle. Elytra with 
striz composed of small, close-set punctures. Beneath piceo-testaceous. 
Length 1.5 mm.; .06 inch. 
Mogqui villages, New Mexico, Dr. Horn. 
Ochthebius nitidus Lec., Agassiz, Lake Superior, 217; O. fos- 
satus Lec. Proc. Acad. Nat. Se. Phila. 1855, 362. 
Lake Superior; Fort Yuma, Cal. The synonym belongs 
